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Low-Field, Time-Resolved Dynamic Nuclear Polarization with Field Cycling and High-Resolution NMR Detection

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Abstract

Dynamic nuclear polarization (DNP) effects in aqueous solutions of stable 4-hydroxy-2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPOL) radicals were studied in a pulsed mode of pumping the electron paramagnetic resonance (EPR) transitions. Our fast field cycling setup allowed us to perform the EPR pumping at low magnetic fields and to detect the enhanced nuclear magnetic resonance signals at 7 T with high spectral resolution. Pumping was performed at two different frequencies, 300 MHz and 1.4 GHz, corresponding to magnetic fields around 10 and 48.6 mT, respectively. For both frequencies, the DNP enhancements were close to the limiting theoretical values of −110 (14N TEMPOL) and −165 (15N TEMPOL). Our pulsed experiments exploit coherent motion of the electronic spins in the radio-frequency field as seen by an oscillatory component in the dependence of the DNP effect on the radio-frequency pulse duration. The DNP enhancement was studied in detail as a function of the pulse length, duty cycle, delay between the pulses, and applied power. The analysis of the results shows that pulsed DNP experiments provide an opportunity to achieve enhancements of about −110 with relatively low applied power as compared to the standard continuous-wave DNP experiments. An adequate theoretical approach to the problem under study is suggested.

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Acknowledgments

The financial support by the Sixth Framework Programme of the European Community via Bio-DNP grant No. 011721 and Marie Curie Actions program (project MIF2-CT-2006-022008), the Russian Fund for Basic Research (projects No. 07-03-00424-a, 08-03-00539-a, 09-03-00837-a) and Deutsche Forschungsgemeinschaft (RFBR-DFG 09-03-91335-NNIO_a) is gratefully acknowledged. K.L.I. acknowledges support from the Alexander von Humboldt Foundation.

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Authors and Affiliations

  1. Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, 14195, Berlin, Germany

    S. E. Korchak, A. S. Kiryutin, K. L. Ivanov, A. V. Yurkovskaya & Hans-Martin Vieth

  2. International Tomography Center, Institutskaya 3a, Novosibirsk, Russia

    A. S. Kiryutin, K. L. Ivanov & A. V. Yurkovskaya

  3. Institute of Chemical Kinetics and Combustion, Institutskaya 3, Novosibirsk, Russia

    Yu. A. Grishin

  4. Max-Planck-Institut für Medizinische Forschung, Jahnstrasse 29, 69120, Heidelberg, Germany

    H. Zimmermann

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  1. S. E. Korchak
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  3. K. L. Ivanov
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  7. Hans-Martin Vieth
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Correspondence to Hans-Martin Vieth.

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Korchak, S.E., Kiryutin, A.S., Ivanov, K.L. et al. Low-Field, Time-Resolved Dynamic Nuclear Polarization with Field Cycling and High-Resolution NMR Detection. Appl Magn Reson 37, 515 (2010). https://doi.org/10.1007/s00723-009-0060-0

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  • DOI: https://doi.org/10.1007/s00723-009-0060-0

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